Adjustable form for molding concrete structures.



A. C. FITCH.

ADJUSTABLE FORM FUR MOLUlNG CONCRETE STRUCTURES.

, APPLICATION HLED OCT. 8. 1914, 1,227,769.

W M n. 2 E 9: T r on YT Z 0 mm m r T m Y T m L m f v w r g 1 WWn- Essm Patented May 29,1917.

4 SHEETSSHEET 2- A. (I. FITCH. ADJUSTABLE FORM FOR MOLDING CONCRETE STRUCTURES.

APPLICATION FILED OCT. 3. 19M.

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A. c. mew I ADJUSTABLE FORM FOR MOLDING CONCRETE STRUCTURES.

Patented May 29, 1917.

. APPLICATION FILED 0518, I914.

4 SHEETS-SHEEI 3 A C. FITCH. ADJUSTABLE FORM FOR MOLDING CONCRETE STRUCTURES.

APPLICATIJN FILED OCT. 8. WM. 1,227,769. Patented May 29,1917.

' 4 SHEETS-SHEET 4' 9min:

1 HTTORHEYS ALBERT C. FITCH, 0]! DETROIT, MICHIGAN.

ADJUSTABLE"F ORM FOR MOLDING CONCRETE STRUCTURES.

Specification of Letters Patent.

l atented May 29, 1917.

Application flled October a, 1914. Serial No. sesjese.

To all whom it may concern:

Be it known that I, ALBERT (I. Frron, a citizen of the United States of America, residin at Detroit, in the county of Wayne and tate of Michigan, have invented certain new and usefulImprovements in Adjustable Forms for Molding Concrete' Struc tures, of which the following is a spccification, reference being had therein to the ac companying drawings.

. The invention. relates to the art oi? forniing monolithic cement strlu tures, such for instance as reinforced. cement buildings. it is the object of the invention to obtain a. construction of adjustable form by which the same forms may be employed for struc -tures having different dimensions. It is a further object to provide means for bracing and strengthening the form so as to prevent distortion of the same; and further to obtain various advantageous features of construction as hereinafter set forth.

In thedrawings:

Figure 1 1s a perspective view of my imio'ved form as arranged for the molding a of a monolithic floor;

' Fig. 2 isa cross'section thereof showing one adjustment;

Figs. 3 and 4. are similar views showing different adjustments for varying depths of -=joist;

Fig. 5 is a section showing the means for ca ping the ends of the form;

' ig. 6 is a cross section through Fig. 5; Fig. 7 is a perspective view of the end' cap 'Q Q-Fig. 8 is a cross section through the form for molding a beam and adjacent joist; 1 Fig. 9 is a section at. right angles to Fig.8. i

"In the construction' of monolithic, rein forced cement buildings it is usual to constructformsof wood for g) 'ng the colums, girders, beams, floors ii d other ele:

ments, of the buildinga As thctimber used for this purposeamist be cut into suitable.

would not suitanother. With my'imp'rove ment in lace-of wooden'fgiorms I employ metallic orms, a-nd. to permit of varying the dimensionsthcseiforms areeoomposed of projecting outward sections adjustably attached to each. other Eachsection comprises a plate forming a molding face and an angle flan e constituting a strengthenin rib or rein orcement irom the mold. The adjacent sections are joined by overlapping their molding faces and by adjustably securing the overlapping sections to each other so that the dimensions may be varied.

As shown in Fig. 1, the form is arranged for molding monolithic floors havlng strengthening beams or -joists depending at intervals. byinetallic inverted U-shaped members or channels A and A, etc, the sides B of which torn! the joist molds. These channel members may be supported upon a suitable false work, such as C, and in, the spaces between them are arranged angle strips. 1), one flange of each being attached to the side. flange B of the channel, while the 0pposite flange extends outward and overlaps the corresponding flange on the adjacent channel. By adjusting the strips D- as to their point of attachment 'to the channel A, the depth of the joist maybe varied, as shown in Figs. 2,3 and 4. This adjustment may be made independent of the spacing between, centers of the floor spans or between centers of the joists, as the over lapping flanges D of the strips of lateral adjustment;

The floor spans and their reinforcing joists are .in turn supported by beams 9r girders, or by the supporting walls of'the building. As shown in Figs. 5 and 6, the floor span is joined toa supportin wall E, and as shown in Figs. 8 and 9 time spans and beams are jointed beams. monolithically iormed In each case'it isnecessar'y to close the endsoi the channels A A, etc.,

and for t-his purpose caps F are provided.

These-.giay be bolted or otherwise secured to the} nds of the joist, and when in positio 'Xclude the. fluid cement from the space w. inthe channel." I

*or forming the moldsfor the girders .a plurality of angle sections G are employed, these being adjustably secured to each other with an overla ping engagement by bolts H. The outwar y-extendmg angle flanges -G constitute bracing ribs which hold the molding'faces from lateral deflection, and which also serve as'bearin .for

abutting against thfalse work, as

D permit at I. Any desired dimension of girder may be obtained by using a larger or smaller number of the sections G and by adjusting these in relation to each other to overlap a greater or lesser extent.

The false worl. is preferably formed of metallic bars J having a series of apertures K therein for the securing of brace bars L and other elements of the frame.

With the construction of the various elements as above described in the construction of a building the bars G, channels A, angles D, bars J andvK, etc, may be readily assembled according to the design of the structure, to form the columns, girders, beams and floor spans, suitably proportioned and arranged in relation toeach other. The cement with its reinforcement is then placed in the mold cavities, and after setting tlie forms may be removed by detaching one section after another. These forms are not injured by use, and as the elements may be made of standard sizes they will be available for use in-other structures.

For permitting adjustment of the overlapping flanges of adjacent sections a series of apertures are provided for the securing bolts, as indicated".-at'M'M' Figs. 1 to 4. It is also-t0 beiniderstood that similar series of holes are provided for each of the overlapping angle sections, which however are not shown in the drawings.

What'I claim as my invention is 1. An adjustable form for molding cecomprising a plurality of adjacent channel sections and angle sections, the latter having fianges secured to the former and oppositely-extending flanges overlapping each other. 1

2. An adjustable form for molding cement .structures comprising a plurality of channel sections, angle sections having flanges adjustably. secured to the flanges of said channel sections and oppositely-extend ing flanges adjustably overlapping each other.

, ment structures,

3; An adjustable form for molding .5... comprising a plurality of parallel inverted U-shaped having'flanges adju'stably secured to the flanges, of the U-shaped sections and oppoother. j

angle sections adjustably secured to and: 'pro ecting from the adjacent channel :sec'

. sections, angle.. sections intermediate sa1dU--shaped sections,

ment structures, comprising'a plurality oi.

adjacent channel sections, flanged members secured to saidchannel sections and overlapping each other in the space therebetween, said flanged members being adjust able in position to increase or diminish the depth of" the, intermediate space in relation to the sides of the channel sections. j

7. An adjustable .form for molding cement structures, comprising a plurality of parallel inverted to varying distances between'centers, and

tions overlapping each other in the-space therebetween, permitting of the adjustments to varying distances between centers oi?v saidohannel sections while still overlapping each other. 1

8. An adjustable form for moldingcement structures com'prising a plurality of adjacent channel sections and angle sections, said angle sections having flan esadjust'ably secured to portions of the regpective-cham uel sections, and means for securingf'said' each having one flangel'adangle sections between sal.

channel sections adjustableflanges tosaid portions of the channel sec tions in difi'erent positions of adjustment, the other flanges of said angle sections-extending in opposite directions and overlapping each other.

In testimony whereof I affix my signature inpresence of two witnesses. I .ALBERT C. FITCH- Witnesses: I

JAMES P. BARRY, ARTHUR D. Power. 

